i have the same exact issue.
in the admin panel i can create categories I have about 8 or so, as soon as i assign an event to any category other than "general" it gets wiped off the public site.
also, i allow registered users to post events, none of the categories show up in the pull down menu other than "general" which is the default with installation
v1.4.3 RC - this happens as a registered user so it shouldn't be a cache thinghttp://www.chloregy.com/events
if you want to look at it